00:01
Okay, so our problem here says that 40 % of students had drinks and snacks, and 60 % of them just had drinks.
00:17
So if you think through that, what that's saying is that 60 % of the students had drinks.
00:25
Well, some smaller portion, some portion of the 60 % also had snacks.
00:31
So i'm guessing we just need to find exactly what percentage had snacks.
00:36
So what we're thinking here is 0 .6, i'm going to write all these as decimals because that's how we find this sort of thing, times some percentage equals 0 .4, right, 40%, because i needed to multiply 60%, or in this case, 0 .6, it's all the same, by some percentage to find some percentage of 60 % that equals 40 % of the total.
01:04
So basically what we're doing is we're solving for whatever this mystery piece is, right? so that's going to involve dividing both sides by 0 .6.
01:17
So all we're doing here is 0 .4 divided by 0 .6.
01:22
And there's also an alternative way to think about this that involves fractions, which might be a little bit more intuitive to you.
01:29
So this is going to become 6 into 40.
01:32
Or i'm sorry, 6 into 4.
01:35
So let's do that.
01:37
Six into four, right? so i know that six is bigger than four, right? so i'm going to need a decimal.
01:45
It's going to go in more than once.
01:47
So i'm going to put my decimal.
01:49
Six goes into four zero times, and i'm going to add some zeros, just so i have some room here.
01:55
Six goes into 40, let's see here, six times, 36, 4, bring down my zero, and again, i'm in the same position...